Optimization of miniature Joule-Thomson cryocooler with non-isometric recuperator on transient characteristics

Hui Chen, Chen-xi Wei, Wen-hao Ding and Ying-wen Liu

Energy, 2023, vol. 267, issue C

Abstract: A novel J-T cryocooler transient performance evaluation criteria parameter, transient evaluation coefficient ξ, is proposed. It includes the cool-down time, refrigerant, and material consumption. The physical and analysis model of ξ of J-T cryocooler with typical and non-isometric structure recuperator was developed based on FORTRAN. We investigated the influence of three vital geometrical parameters (the demarcation point i, the fin pitch of the hot part fp1, and the fin pitch of the cold part fp2) on ξ of the JT cryocooler. And the structure of the recuperator was further optimized using response surface methodology (RSM). The optimization results are in good agreement with our model. It was discovered that the optimal structure accelerates the cool-down rate and uses less refrigerant with a lightweight equipment design. The p-d diagram of argon is analyzed to explain the good transient performance of the optimal first-sparse-then-dense structure. It illustrates the relationship between the fins configurations and mass flow rate. Adding fins to the spiral circles close to the cold end can accelerate the cool-down more effectively. The established optimization model provides helpful guidance for cool-down performance optimization.

Keywords: J-T cryocooler; RSM; First-sparse-then-dense; Transient evaluation coefficient (search for similar items in EconPapers)
Date: 2023
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:267:y:2023:i:c:s0360544222034399

DOI: 10.1016/j.energy.2022.126552

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